Multi-solid-waste admixture, preparation method thereof and cement mortar

Abstract

The invention provides a multi-solid-waste admixture, a preparation method thereof and cement mortar, and relates to the technical field of civil engineering. The multi-solid-waste admixture provided by the invention comprises the following raw materials in parts by mass: 80-120 parts of modified oil shale semicoke-iron tailings, 15-40 parts of carbide slag, 20-40 parts of high-calcium fly ash, 2-5 parts of an alkaline activator and 1-3 parts of a water reducing agent, the modified oil shale semi-coke-iron tailings are obtained by mixing oil shale semi-coke and iron tailings and calcining the mixture at a high temperature of 500-700 DEG C; the mass ratio of the oil shale semicoke to the iron tailings is (80-100): (10-20). The admixture provided by the invention mainly adopts industrial wastes, effectively solves the problem of accumulation of the oil shale semicoke, the carbide slag and the iron tailings, turns waste into wealth, and has environmental benefits, economic benefits and social benefits; and the later strength of the material can be improved while the large mixing amount of industrial solid waste is realized.

Description

technical field [0001] The invention relates to the technical field of civil engineering, in particular to a multi-solid waste admixture, a preparation method thereof and cement mortar. Background technique [0002] Polyvinyl chloride (PVC) is a widely used chemical product. About 1.5-1.9 tons of carbide slag is discharged per ton of PVC produced. Due to the high transportation costs and the large number of impurities in the carbide slag itself, its comprehensive utilization rate is not high. Landfill or stockpiling is usually used, which is likely to cause surface and groundwater pollution and cause great damage to the ecological environment. Therefore, calcium carbide slag urgently needs to be treated as a resource to eliminate the negative impact on the ecological environment. [0003] my country's annual discharge of iron tailings is hundreds of millions of tons, but the comprehensive utilization rate of iron tailings is less than 30%. While bringing economic benefits,...

AI Technical Summary

Problems solved by technology

[0003] my country's annual discharge of iron tailings is hundreds of millions of tons, but the comprehensive utilization rate of iron tailings is less than 30%.

Oil shale dry distillation or direct combustion produces a large amount of ash, 1 ton of raw ore produces about 0.7 to 0.9 tons of semi-coke, which requires a large amount of land to be stacked in the open air, causing secondary pollution such as dust and water, and the pollution problem is prominent

Although there are currently researches on the use of oil shale semi-coke as building materials, due to its low activity, it is difficult to use it in large quantities, and there is a problem of insufficient strength in the later stage

Images